package core.tool.encryption.ibmsample;

/* 
 安全程序 DESede/DES 测试
 */
import java.security.*;
import javax.crypto.*;

public class testdes {
	public static void main(String[] args) {
		testdes my = new testdes();
		my.run();
	}

	public void run() {
		// 添加新安全算法 , 如果用 JCE 就要把它添加进去
		Security.addProvider(new com.sun.crypto.provider.SunJCE());
		String Algorithm = "DES"; // 定义 加密算法 , 可用 DES,DESede,Blowfish
		String myinfo = "要加密的信息";
		try {
			// 生成密钥
			KeyGenerator keygen = KeyGenerator.getInstance(Algorithm);
			SecretKey deskey = keygen.generateKey();
			// 加密
			System.out.println("加密前的二进串 :" + byte2hex(myinfo.getBytes()));
			System.out.println("加密前的信息 :" + myinfo);
			Cipher c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.ENCRYPT_MODE, deskey);
			byte[] cipherByte = c1.doFinal(myinfo.getBytes());
			System.out.println("加密后的二进串 :" + byte2hex(cipherByte));
			// 解密
			c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.DECRYPT_MODE, deskey);
			byte[] clearByte = c1.doFinal(cipherByte);
			System.out.println("解密后的二进串 :" + byte2hex(clearByte));
			System.out.println("解密后的信息 :" + (new String(clearByte)));
		} catch (java.security.NoSuchAlgorithmException e1) {
			e1.printStackTrace();
		} catch (javax.crypto.NoSuchPaddingException e2) {
			e2.printStackTrace();
		} catch (java.lang.Exception e3) {
			e3.printStackTrace();
		}
	}

	public String byte2hex(byte[] b) // 二行制转字符串
	{
		String hs = "";
		String stmp = "";
		for (int n = 0; n < b.length; n++) {
			stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
			if (stmp.length() == 1)
				hs = hs + "0" + stmp;
			else
				hs = hs + stmp;
			if (n < b.length - 1)
				hs = hs + ":";
		}
		return hs.toUpperCase();
	}
}
